Oeversee Wastewater Treatment Plant, Schleswig-Holstein, Germany

The Oeversee wastewater treatment plant is located in the municipality of Oeversee, in the district of Schleswig-Flensburg, Schleswig-Holstein, Germany. It served a population of 1,587 and is now closed. The plant was situated near the Treene river, a tributary of the Eider, which flows into the North Sea. As a secondary treatment facility, Oeversee met the minimum requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC) for small agglomerations (under 2,000 population equivalent). The directive mandates secondary treatment for all discharges from agglomerations of this size, ensuring reduction of organic matter and suspended solids. The plant's designed capacity was 2,500 cubic meters per day, with an average discharge volume of 401.63 cubic meters per day. The plant's treated effluent was discharged into the Treene river, which flows into the Eider, one of the major rivers in Schleswig-Holstein. The Eider eventually reaches the North Sea near Tönning. The Treene and Eider watersheds support diverse aquatic life and are important for regional biodiversity, including migratory fish species.

The plant discharged into the Treene river, a tributary of the Eider river system in Schleswig-Holstein. The Eider flows into the North Sea, an ecologically sensitive marine environment. The watershed supports diverse aquatic habitats and is important for migratory fish such as salmon and sea trout. The region's flat terrain and agricultural land use mean that nutrient management is a key concern for water quality.